On shutdown I get this (edited down a bit to be more legible):
Stopping firewalld - dynamic firewall daemon...
NETFILTER_CFG table=nat family=2 entries=55
NETFILTER_CFG table=mangle family=2 entries=40
NETFILTER_CFG table=raw family=2 entries=28
NETFILTER_CFG table=security family=2 entries=13
NETFILTER_CFG table=filter family=2 entries=93
------------[ cut here ]------------
WARNING: CPU: 1 PID: 21512 at net/netfilter/core.c:218
__nf_hook_entries_try_shrink+0x106/0x130
CPU: 1 PID: 21512 Comm: iptables-restor Not tainted
4.13.0-08555-gc0da4fa0d1a5 #7
Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.4.17 05/10/2017
RIP: 0010:__nf_hook_entries_try_shrink+0x106/0x130
Call Trace:
nf_unregister_net_hooks+0x117/0x240
ipv4_hooks_unregister+0x60/0x70 [nf_conntrack_ipv4]
nf_ct_netns_put+0x48/0x80 [nf_conntrack]
conntrack_mt_destroy+0x15/0x20 [xt_conntrack]
cleanup_match+0x43/0x70
cleanup_entry+0x42/0xc0
__do_replace+0x17a/0x1f0
do_ipt_set_ctl+0x146/0x1b0
nf_setsockopt+0x46/0x80
ip_setsockopt+0x82/0xb0
raw_setsockopt+0x34/0x40
sock_common_setsockopt+0x14/0x20
SyS_setsockopt+0x80/0xe0
entry_SYSCALL_64_fastpath+0x13/0x94
[ .. warning repeats a few times .. ]
---[ end trace 56a6f5b20d97161d ]---
NETFILTER_CFG table=broute family=7 entries=0
NETFILTER_CFG table=nat family=7 entries=0
NETFILTER_CFG table=filter family=7 entries=0
NETFILTER_CFG table=mangle family=2 entries=6
and some searching notes that the kernel test robot already reported
this a few days ago but nobody reacted.
The kernel test robot seems to blame commit d3ad2c17b404 ("netfilter:
core: batch nf_unregister_net_hooks synchronize_net calls").
Hmm?
Linus
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